Fix param order when adding missing @param annotations

[dereuromark]

Summary

When a docblock has only some @param annotations (e.g., only the middle parameter documented), the fixer was adding missing params in the wrong order.

Before this fix:

/**
 * @param array<string> $lines
 */
public function foo(Node $parent, array $lines, int $indent): void

Would be "fixed" to:

/**
 * @param array<string> $lines
 * @param int $indent
 * @param Node $parent
 */

After this fix:

/**
 * @param Node $parent
 * @param array<string> $lines
 * @param int $indent
 */

Changes

• Rewrote canAddMissingParams() to properly track positions and insert params in correct order
• Params before the first existing @param are queued and inserted before it
• Params after an existing @param are inserted after it
• Added test case for this scenario

Test plan

• New test case added for middle-param scenario
• All existing tests pass (82 tests, 88 assertions)
• PHPStan passes
• PHPCS passes

🤖 Generated with Claude Code